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President Donald Trump on the South Lawn of the White House, Friday, July 27, 2018.

A financial shockwave ripped through Turkey on Friday, when its currency nosedived on concerns about its economic policies and a dispute with the U.S., which President Donald Trump stoked further with a promise to double tariffs on the NATO ally.

The lira tumbled 14 percent in one day, to 6.51 per dollar, a massive move for a currency that will make the Turkish poorer and further erode international investors' confidence in the country.

The currency's drop — 41 percent so far this year — is a gauge of fear over a country coming to terms with years of high debt, international concern over President Recep Tayyip Erdogan's push to amass power, and a souring in relations with allies like the U.S.

The diplomatic dispute with the U.S. was one of the triggers that turned market jitters into a full-blown route this week.

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Turkey has arrested an American pastor and put him on trial for espionage and terror-related charges linked to a failed coup attempt in the country two years ago. The U.S. responded by slapping sanctions on Turkey and threatening more.

The sides held talks in Washington this week but failed to resolve the spat, and Trump took advantage of Turkey's turmoil on Friday to turn the screws on the country.

Trump tweeted that he had authorized the doubling of steel and aluminum tariffs "with respect to Turkey."

He added that imposing sanctions on a NATO ally wouldn't help Washington achieve its goals and would harm an "alliance that was built by surmounting arduous tests." Aksoy said Turkey "always backs the resolution of issues through diplomacy, dialogue, goodwill and mutual understanding," but would retaliate for Trump's decision.

"All steps taken against Turkey will be given the necessary response, as they have in the past," he said.

In what appears to be a diplomatic riposte, Turkey later said Erdogan had held a phone call with Russian President Vladimir Putin to discuss economic ties. It did not disclose details, but suggests Turkey might gravitate further away from its NATO allies toward cooperation with Russia, whose relations with the West are at their lowest since the Cold War.

Turkey's woes have been aggravated by investor worries about the economic policies of Erdogan, who won a new term in office in June with sweeping new powers.

Erdogan has been putting pressure on the central bank to not raise interest rates in order to keep fueling economic growth. He claims higher rates lead to higher inflation — the opposite of what standard economic theory says.

Independent analysts argue the central bank should instead raise rates to tame inflation and support the currency.

In modern economies, central banks are meant to be independent of governments to make sure they set policies that are best for the economy, not politicians. But since adopting increased powers, Erdogan appears to have greater control over the bank as well.

Erdogan on Friday appealed for calm and called on people to change foreign money into local lira.

The defiant tone and war rhetoric only hurt the lira more, before Erdogan's finance chief and son-in-law, Berat Albayrak, tried to ease investor concerns during a conference, saying the government would safeguard the independence of the central bank.

"One of our principles will be ensuring the full independence of monetary policy," Abayrak said as he outlined his ministry's "new economic model."

The currency drop is particularly painful for Turkey because the country finances a lot of its economic growth with foreign money. As the currency drops, Turkish companies and households with debt in foreign currencies see the cost of repaying those loans expand.

Coupled with an inflation rate of nearly 16 percent, that could cause severe damage to the local economy.

Foreign investors could be spooked and try to pull their money out, reinforcing the currency drop and potentially leading to financial instability.

Aylin Ertan, a 43-year-old caterer in Ankara, said she was concerned over the future of her small business.

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"The price of the food that I buy increases day by day, the fuel that I put in my car to distribute lunches is more expensive, but I cannot raise my prices from one day to the next," she said. "On some days, I end the day with a loss."

Turkey's woes also shook world markets, pushing down stock indexes. The euro sagged to a 13-month low against the dollar on concerns that European banks operating in Turkey could suffer losses.

But analysts say that while there may be losses at some banks, Turkey's economic problems do not pose a big threat to Europe or other big economies like the United States.